Defendant was convicted of conspiracy to manufacture a controlled substance, methamphetamine. ORS 161.450. The single issue on appeal1 is whether an investigating officer’s presence in the courtroom at trial violated defendant’s constitutional right to cross-examine and to confront the witnesses against him. Or Const Art I, § 11. We find that it did not and affirm.

At commencement of the trial, presumably in anticipation of defendant’s motion to exclude witnesses under OEC 615,2 the state “moved” to allow former Lake County Sheriff Griffin to sit with and assist the prosecution during the trial. The state advised the court that Griffin would also be called as a witness. He had been the chief investigator in the case and had interviewed most of the witnesses, including defense alibi witnesses. The trial court granted the state’s motion over defendant’s objection, concluding that the state had established that Griffin’s presence was essential to assist the prosecution. OEC 615(3).

Defendant assigns error to the court’s order permitting Griffin to be present in the courtroom. He does not argue that the court lacked authority or abused its discretion under OEC 615(3), but relies on the constitutional objection that he presented to the trial court:

“I guess the process I foresee when he is called as a rebuttal witness, for example, he’s had the opportunity to sit and listen to all of our alibi witnesses testify, and it will be much more difficult for us to cross-examine him about something he may *569have said or done or that occurred when he was down interviewing our witnesses — our alibi witnesses in Sacramento. It certainly would not be as easy to confront him with some conduct or some allegation about his conduct if he’s here and has listened to the entire testimony.” (Emphasis supplied.)

Although defendant does not argue that he was denied the opportunity to cross-examine and confront Griffin, he contends that his ability to cross-examine was impaired. The United States Supreme Court has explained that a criminal defendant is “guarantee^] an opportunity for effective cross-examination, not cross-examination that is effective in whatever way, and to whatever extent, the defense might wish.” Delaware v. Fernsterer, 474 US 15,20,106 S Ct 292,88 L Ed 2d 15 (1985). (Emphasis in original.)3 Defendant has failed to demonstrate that his constitutional rights have been violated.

We are aware that a very real potential exists in this kind of case for the prosecution to gain an unfair advantage at trial. However, given the only issue presented, that potential did not rise to the level of a constitutional violation.

Affirmed.

“In all criminal prosecutions, the accused shall have the right * * * to meet the witnesses face to face * *